Flue gas flooding is one of the important technologies to improve oil recovery and achieve greenhouse gas storage. In order to study multicomponent flue gas storage capacity and enhanced oil recovery (EOR) performance of flue gas water-alternating gas (flue gas–WAG) injection after continuous waterflooding in an oil reservoir, a long core flooding system was built. The experimental results showed that the oil recovery factor of flue gas–WAG flooding was increased by 21.25% after continuous waterflooding and flue gas–WAG flooding could further enhance oil recovery and reduce water cut significantly. A novel material balance model based on storage mechanism was developed to estimate the multicomponent flue gas storage capacity and storage capacity of each component of flue gas in reservoir oil, water and as free gas in the post-waterflooding reservoir. The ultimate storage ratio of flue gas is 16% in the flue gas–WAG flooding process. The calculation results of flue gas storage capacity showed that the injection gas storage capacity mainly consists of N₂ and CO₂, only N₂ exists as free gas phase in cores, and other components of injection gas are dissolved in oil and water. Finally, injection strategies from three perspectives for flue gas storage, EOR, and combination of flue gas storage and EOR were proposed, respectively.

烟气驱油是提高石油采收率和实现温室气体存储的重要技术之一。为了研究油层中连续注水后多组分烟道气的存储能力和烟道气水（WAG）注入的提高的采收率（EOR）性能，建立了长岩心驱油系统。实验结果表明，连续注水后，烟气-WAG驱油的采收率提高了21.25％，烟气-WAG驱油可以进一步提高采收率，显着降低含水率。建立了一种基于储藏机理的新型物料平衡模型，以估算多组分烟道气的储量和储油中烟气各组分的储量，注水后储层中的水和游离气体。在烟气-WAG驱油过程中，烟气的最终存储率为16％。烟气存储量的计算结果表明，注入气的存储量主要由氮组成_在图2和CO _2中，仅N ₂作为自由气相存在于堆芯中，并且注入气体的其他成分溶解在油和水中。最后，从烟气储存，EOR，烟气储存与EOR结合的三个角度分别提出了注入策略。